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Unless you are using old antifreeze with enough globs of crud in it to constrict your thermostat and prevent good coolant movement, your overheating is more likely caused by a problem with your electric fan, rather than a problem with your thermostat. The fans in front of your radiator and A/C heat exchanger don't do anything when your car is moving faster than, say, 20 or 25 miles per hour. If you only drove on the highway, you wouldn't even need a fan. However, they're really needed when you're sitting at a stoplight or driving at low speed.

Your fan system has a few possible trouble spots. I believe that your Accord has an electric, not a belt-driven main fan. And, those electric fans do go bad. This is not uncommon; fans are stuck out in the elements, and they can rust up, a blade can crack, or the contacts could corrode. You can test this by jumping 12v of power to the fan terminals to see if it spins up--and stays spinning for at least 30 seconds or so. A fan may work briefly and then cut out if its bearings are shot--as they overheat and expand, they'll grind the fan to a halt. If your fan seems to be working fine, double-check that the wiring connectors are nice and shiny so that they're making a good connection.

Second, and equally possible, your fan relay may have gone bad. There's a coolant temperature sensor that is designed to send a signal to the fan relay if the coolant gets too hot. That relay has a mechanical element in it that also can go bad--it may be receiving the signal to do something, but the relay isn't closing properly to kick off the fan.

Third, the coolant sensor sending a signal to the fan relay may also have gone bad. This is normally a separate sensor from the one sending a signal to the temperature gauge in your dashboard.

Driving entirely without a thermostat will greatly lower the coolant temperature in your car and will give you a temporary fix for this problem while you troubleshoot your fan system. However, because the coolant will never fully heat up, you may experience a decrease in fuel economy and your tailpipe emissions may go up. And, of course, you won't get very much heat from your climate control system. Driving without a thermostat is a short-term fix, not the solution to your problem.

Could be a few things. If your fans were just working then just stopped, it could be the fan motor. It could also be the relay. If you know where your lo speed and high speed cooling fan relays are located, you can eliminate this step easily. Take a known working relay (rear defrost or something not essential for starting) and replace the fan relay with the known operational relay while your engine is running and A/C is turned on. If the fans start, there's your problem, if not, then it's probably your fan motors.
Make sure the fuse that protects the fan speed relays is not blown as well.